Let’s say the line is -7.0. What the oddsmaker is saying is that one team is favored to beat the other team, in the game they are playing against each other, by 7.0 points. From that estimation, we can then handicap the number and determine if the line is on or off. If the line is right on, there is no betting value, so we don’t make a bet. However, if after handicapping the line we determine the line is off, then we have found value on one side or the other, which will generate a bet from us.
This is the essence of betting on sports.